How did the Holy Prophet (pboh) sacrificed his own life for the
well-being of other human beings?

His greatest quality was the one that is set out in the Holy Quran
in the following words: Tell them: My worship and my sacrifices
and my living and my dying are all wholly for Allah (6:163). This
means that the whole purpose of his life was to demonstrate the
glory of God and to provide comfort for His creatures so that
through his constant suffering of death they might procure life.